Discussion on Calculation Method for Temperature Drop of Workpiece as Being Rolled on Steel Pipe Hot-rolling Line

Described here in the paper are three heat transfer types and the calculation formulas for heat flow density,heat flux and convective heat transfer coefficient.And elaborated is a calculation method for temperature drop of workpiece in pipe hot-rolling workshop with which the temperature drop data for the representative tube sizes as list in a certain rolling scheme are calculated out.As a result,it shows that the temperature numerical values of the workpieces as produced during the entire production process can be obtained by means of as per the sizes of the billet,the shell and the tube as list in the rolling scheme,first computing out the heat capacity and the heat density,and then the temperature drop per second and the temperature drop in each period of transportation time of the workpiece.The above mentioned method is capable of providing support to the manufacturing process in terms of temperature scheme,and also is helpful for working out pin-pointed energy-saving actions,optimizing the process layout and determining types of the transportation facilities.